I bought it for a night run. After about 5 runs (every about an hour or so) the light is so dim it makes no sense. I've been trying to see if the battery is easily replaceable or something and while there are screws that can hold something I haven't even dared to figure out which battery to use (nor have I done any internet research) . let's see if I can). I'll wear them until they stop glowing completely, but for the most part they're gone.
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